100 hrs on 2014 yz450f, shim valves or replace them?

Yamaha YZ450F 2014

79 replies to this topic
  • ttr230rider6

Posted May 06, 2016 - 06:02 PM

#61

Yes...


&%$#@!... That delays me to getting it back together till late next week

  • Sheriff245

Posted May 07, 2016 - 04:11 AM

#62

&%$#@!... That delays me to getting it back together till late next week


Take the cylinder off carefully, you may be able to reuse the gasket. Always better to replace but sometimes they come off with no damage, and it can save your weekend...

  • ttr230rider6

Posted May 07, 2016 - 06:36 AM

#63

Take the cylinder off carefully, you may be able to reuse the gasket. Always better to replace but sometimes they come off with no damage, and it can save your weekend...


I figured if I'm going to pull the cylinder and everything to do the rings I'm just going to do the the top end while I'm at it. I order a new gasket and new oem top end kit. So I'm hung up anyways :(

  • grayracer513

Posted May 07, 2016 - 10:17 AM

#64

The base gasket is a steel shim type, and cannot be reused.

  • Aaron_Baker

Posted May 09, 2016 - 11:34 AM

#65

I've got a 14 450 it just started getting hard to start checked the clearance and the was no gap here's a valve out of it its done about 120hrs now I

  • toten

Posted May 09, 2016 - 11:42 AM

#66

I'm impressed that it ran at all with no gap. Have you done valve checks/adjustments before? I don't see a picture either.



  • Aaron_Baker

Posted May 09, 2016 - 12:04 PM

#67

The smallest gauge I had was .03 and that wouldn't go in tbh it ran alright once it was going. I did a full build on it about 25hrs ago and they was OK then

  • Aaron_Baker

Posted May 09, 2016 - 12:06 PM

#68

They must of just decided they've had enough lol

Attached Thumbnails

  • IMG-20160506-WA0005.jpeg

Edited by Aaron_Baker, May 09, 2016 - 12:07 PM.


  • GHILL28

Posted May 09, 2016 - 12:42 PM

#69

Fortunately OEM valves for this bike are pretty damn cheap.

 

Edit:  Head assembly is only ~$335 too.


Edited by GHILL28, May 09, 2016 - 12:44 PM.


  • Aaron_Baker

Posted May 09, 2016 - 12:59 PM

#70

Not here in the UK they was about £50 each 



Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • toten

Posted May 09, 2016 - 02:15 PM

#71

In that case it might not be a bad idea to get someone in the US to send you a new complete head. Not that much more than new valves.



  • ttr230rider6

Posted May 11, 2016 - 05:07 PM

#72

Does this cylinder need to be honed? You can still see the lines going horizontally and doesn't seem glazed but I'm not sure. What do you think ImageUploadedByThumper Talk1463015241.157308.jpg

  • Sheriff245

Posted May 11, 2016 - 06:45 PM

#73

Does this cylinder need to be honed? You can still see the lines going horizontally and doesn't seem glazed but I'm not sure. What do you think ImageUploadedByThumper Talk1463015241.157308.jpg


That side looks great to me.

  • ttr230rider6

Posted May 12, 2016 - 02:30 AM

#74

That side looks great to me.


So if the whole thing looks like this you wouldn't worry about getting it honed?

  • grayracer513

Posted May 12, 2016 - 06:25 AM

#75

I'm a huge proponent of using ball hones on Nikasil four-strokes, but that one simply doesn't merit doing it.  Clean it up with a Scotch-Brite and run it.



  • Sheriff245

Posted May 12, 2016 - 08:58 AM

#76

So if the whole thing looks like this you wouldn't worry about getting it honed?

I would put it back in as is, no honing.



  • ttr230rider6

Posted May 14, 2016 - 12:55 PM

#77

Well guys I got it all finished and I have the bike broke in!! I must say it went pretty smooth and thanks to all you guys for helping out answering my questions! I really appreciate it. I pretty much followed the same break in period as the Manual recommends (I did the same when it was new) and everything seems to work flawlessly with no leaked or anything.

I think a little bit of coolant got in the bottom end when I was taking it apart. So I refilled with new oil and And after the initial start up, of Idling for a few minutes, I drained the oil again and it was a little cloudy. So I refilled it again and did my break in. Going to dump the oil again tomorrow and refill it again.

  • dougla12

Posted May 14, 2016 - 06:33 PM

#78

Fortunately OEM valves for this bike are pretty damn cheap.

Edit: Head assembly is only ~$335 too.


What website to order from?

  • GHILL28

Posted May 14, 2016 - 07:00 PM

#79

BikeBandit, Chapparal, RockyMountainATV, etc etc



  • Edge316

Posted May 14, 2016 - 07:35 PM

#80

If anyone's interested there's a 16 yz450f head for sale in Thumper talk classifieds. I believe the guys asking 350.00...Seems like a smoking deal for a head with 5 hours on it.





Related Content

Forums
Photo

2014 YZ450f with rebuilt engine? by TN Dirt Rider


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  42 replies
Forums
Photo

2014 yz450f fork/shock oil change help. by yzUSMCf


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  40 replies
Forums
Photo

Cycra Powerflow Plastic Kit YZ250F/YZ450F (2014/15) by Quake


Dirt Bike   Make / Model Specific   Yamaha   WR/YZ 250F
  • * * * * *
  • Hot  42 replies
Forums
Photo

Problem with 14 450s by boegey


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  56 replies
Forums
Photo

These forks!?! 2014 YZ450... by swaldrop


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  87 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.